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sound: oss: msnd_pinnacle: avoid interruptible_sleep_on_timeout

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We want to remove all sleep_on variants from the kernel because they are
racy. In case of the pinnacle driver, we can replace
interruptible_sleep_on_timeout with wait_event_interruptible_timeout
by changing the meaning of a few flags used in the driver so they
are cleared at wakeup time, which is a somewhat more appropriate
way to do the same, although probably still racy.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Arnd Bergmann 2014-01-02 13:07:47 +01:00 committed by Takashi Iwai
parent cf67c8e71b
commit 1a21576562
1 changed files with 18 additions and 13 deletions
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31
sound/oss/msnd_pinnacle.c
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@ -664,12 +664,15 @@ static long dev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
static void dsp_write_flush(void)
{
int timeout = get_play_delay_jiffies(dev.DAPF.len);
if (!(dev.mode & FMODE_WRITE) || !test_bit(F_WRITING, &dev.flags))
return;
set_bit(F_WRITEFLUSH, &dev.flags);
interruptible_sleep_on_timeout(
&dev.writeflush,
get_play_delay_jiffies(dev.DAPF.len));
wait_event_interruptible_timeout(
dev.writeflush,
!test_bit(F_WRITEFLUSH, &dev.flags),
timeout);
clear_bit(F_WRITEFLUSH, &dev.flags);
if (!signal_pending(current)) {
current->state = TASK_INTERRUPTIBLE;
@ -897,6 +900,7 @@ static int dsp_read(char __user *buf, size_t len)
{
int count = len;
char *page = (char *)__get_free_page(GFP_KERNEL);
int timeout = get_rec_delay_jiffies(DAR_BUFF_SIZE);
if (!page)
return -ENOMEM;
@ -936,11 +940,11 @@ static int dsp_read(char __user *buf, size_t len)
if (count > 0) {
set_bit(F_READBLOCK, &dev.flags);
if (!interruptible_sleep_on_timeout(
&dev.readblock,
get_rec_delay_jiffies(DAR_BUFF_SIZE)))
if (wait_event_interruptible_timeout(
dev.readblock,
test_bit(F_READBLOCK, &dev.flags),
timeout) <= 0)
clear_bit(F_READING, &dev.flags);
clear_bit(F_READBLOCK, &dev.flags);
if (signal_pending(current)) {
free_page((unsigned long)page);
return -EINTR;
@ -955,6 +959,7 @@ static int dsp_write(const char __user *buf, size_t len)
{
int count = len;
char *page = (char *)__get_free_page(GFP_KERNEL);
int timeout = get_play_delay_jiffies(DAP_BUFF_SIZE);
if (!page)
return -ENOMEM;
@ -995,10 +1000,10 @@ static int dsp_write(const char __user *buf, size_t len)
if (count > 0) {
set_bit(F_WRITEBLOCK, &dev.flags);
interruptible_sleep_on_timeout(
&dev.writeblock,
get_play_delay_jiffies(DAP_BUFF_SIZE));
clear_bit(F_WRITEBLOCK, &dev.flags);
wait_event_interruptible_timeout(
dev.writeblock,
test_bit(F_WRITEBLOCK, &dev.flags),
timeout);
if (signal_pending(current)) {
free_page((unsigned long)page);
return -EINTR;
@ -1044,7 +1049,7 @@ static __inline__ void eval_dsp_msg(register WORD wMessage)
clear_bit(F_WRITING, &dev.flags);
}
if (test_bit(F_WRITEBLOCK, &dev.flags))
if (test_and_clear_bit(F_WRITEBLOCK, &dev.flags))
wake_up_interruptible(&dev.writeblock);
break;
@ -1055,7 +1060,7 @@ static __inline__ void eval_dsp_msg(register WORD wMessage)
pack_DARQ_to_DARF(dev.last_recbank);
if (test_bit(F_READBLOCK, &dev.flags))
if (test_and_clear_bit(F_READBLOCK, &dev.flags))
wake_up_interruptible(&dev.readblock);
break;